http://images.google.com/imgres?imgurl=http://www.lib.utexas.edu/geo/balcones_escarpment/images/p6fig4.gif&imgrefurl=http://www.lib.utexas.edu/geo/balcones_escarpment/pages1-14.html&h=1138&w=1100&sz=43&hl=en&start=16&tbnid=_QVLSUwHX1WkHM:&tbnh=150&tbnw=145&prev=/images%3Fq%3Disohyet%26gbv%3D2%26hl%3DenThe above map is a map with isohyets of Texas from 1961 to 1980 showing the average annual percipitation, it indicating the increased rainfall. Isohyet is a type of contour map where a line joins points of equal precipitation. A map with isohyets is also called an isohyetal map.
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